Charts
Pulls the most recent measurement of every site (excluding starter projects). Tooltips are only shown on green (well scoring) data points.
Page Weight vs LCP 1,379 sites
JavaScript Weight vs LCP 1,379 sites
TTFB vs LCP 1,378 sites
Web Font Weight vs CLS 1,380 sites
Third Party vs Performance 1,378 sites
Usually things like analytics, embeds, fonts, tag managers, ads weighted against Lighthouse’s Performance score.
DOM Elements vs Performance 1,372 sites
DOM element count against Lighthouse’s Performance score. A big document is paid for in style and layout work on every frame.
JavaScript Weight by Site Generator 761 sites
One row per generator, one dot per site, ordered by median.
Across 9 generators with at least five sites each: twenty more were detected too rarely in this data set.
Client Rendering by Generator 353 sites
Sites that painted nothing with scripts disabled, by the tool their page reports building it. One row per generator: a dot for how many of its sites were judged, a dot for how many came up blank, and a line joining them — so the length of the row is the size of the sample the finding came out of.
20 empty pre-JavaScript blank pages from 353 measured sites.
The other 23 generators flagged nothing across 144 judged sites between them — mostly on samples of a handful of sites each.
TTFB by Host 1,294 sites
Lab vs Field LCP 253 sites
One row per site: a dot for what our throttled lab run measured, a dot for what real users actually saw (Chrome’s field p75) and a line joining them.
The lab is slower than reality on 232 of these and faster on 21.